diff --git a/include/boost/predef/os/cygwin.h b/include/boost/predef/os/cygwin.h
new file mode 100644
index 0000000000000000000000000000000000000000..9d36f0f31749666c3de92fb48b23d72977909b0c
--- /dev/null
+++ b/include/boost/predef/os/cygwin.h
@@ -0,0 +1,45 @@
+/*
+Copyright Rene Rivera 2008-2015
+Distributed under the Boost Software License, Version 1.0.
+(See accompanying file LICENSE_1_0.txt or copy at
+http://www.boost.org/LICENSE_1_0.txt)
+*/
+
+#ifndef BOOST_PREDEF_OS_CYGWIN_H
+#define BOOST_PREDEF_OS_CYGWIN_H
+
+#include <boost/predef/version_number.h>
+#include <boost/predef/make.h>
+
+/*`
+[heading `BOOST_OS_CYGWIN`]
+
+[@http://en.wikipedia.org/wiki/Cygwin Cygwin] evironment.
+
+[table
+    [[__predef_symbol__] [__predef_version__]]
+
+    [[`__CYGWIN__`] [__predef_detection__]]
+    ]
+ */
+
+#define BOOST_OS_CYGWIN BOOST_VERSION_NUMBER_NOT_AVAILABLE
+
+#if !defined(BOOST_PREDEF_DETAIL_OS_DETECTED) && ( \
+    defined(__CYGWIN__) \
+    )
+#   undef BOOST_OS_CYGWIN
+#   define BOOST_OS_CYGWIN BOOST_VERSION_NUMBER_AVAILABLE
+#endif
+
+#if BOOST_OS_CYGWIN
+#   define BOOST_OS_CYGWIN_AVAILABLE
+#   include <boost/predef/detail/os_detected.h>
+#endif
+
+#define BOOST_OS_CYGWIN_NAME "Cygwin"
+
+#endif
+
+#include <boost/predef/detail/test.h>
+BOOST_PREDEF_DECLARE_TEST(BOOST_OS_CYGWIN,BOOST_OS_CYGWIN_NAME)